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Working with Linux howtos
- Troubleshooting memory usage
- Moving files around: Setting up FTP
- Backup FTP server: offsite backups that you control
- SCP: an FTP alternative
- Automated incremental backups: Script to automate backups using SSHFS and rdiff-backup
- Securing your server: is your port showing?
- Securing your server: setting up a Linux firewall using IPTables and Webmin
- Preventing Brute Force SSH Attacks
- Backups with rSync
- Automated backups with RSync
- Accurate time with NTP
- Setting a UTC timezone
- Changing a hostname
- Application environment setup (using bash profiles)
Automated, Secure Backups via Rsync
Want to automate your backups? Want to do it securely? Want it to be efficient and fast? Then Rsync backups over SSH using public/private keys are for you.
The following script will setup a nightly rsync backup of a directory you specify on your host to another Unix server (whatever you use as remote_host). The remote host must be running SSHd.
remote_host=ahostname.com
directory_to_backup=/a/directory/to/backup
{
cd /root
# create a private key with no pass phrase.
# You want to make sure no one ever gets access to this file
# (else they'll be able to log into your remote host)
ssh-keygen -f backup.private.key -t rsa -C "backupkey" -N ""
# pop the public key into a variable
public_key=`cat backup.private.key.pub`
# add a backup user on the remote machine, install the public key
ssh $remote_host "adduser backupuser;mkdir ~backupuser/backups; mkdir ~backupuser/.ssh;echo
\"$public_key\" > ~backupuser/.ssh/authorized_keys"
# back on the localhost setup a job that will do the backup
echo "
#!/bin/bash
# invoked by /etc/cron.daily/rsyncbackupcronjob.sh
ssh-add /root/backup.private.key
# copy a directory to the backup server
rsync --delete --compress --archive --rsh=ssh $directory_to_backup
backupuser@$remote_host:backups/
" > /root/rsyncbackup.sh
chmod +x /root/rsyncbackup.sh
# and then you need a job to lauch the previous one. This job will execute nightly
via cron
echo '#!/bin/bash' > /etc/cron.daily/rsyncbackupcronjob.sh
echo "ssh-agent /root/rsyncbackup.sh" >> /etc/cron.daily/rsyncbackupcronjob.sh
chmod +x /etc/cron.daily/rsyncbackupcronjob.sh
}
Edit /root/rsyncbackup.sh if you want to change the files/directories you need backed up.

